<script lang="ts" setup name="XtxCarousel">
// 轮播图组件封装
import {HomeBanner} from '@/types/data'
import { onMounted, onUnmounted, ref } from 'vue';

// 父向子传值vue3+ts语法
const {slides,autoplay,duration}= defineProps<{
    slides:HomeBanner[]
    autoplay?:boolean
    duration?:number
}>()
// 轮播图高亮圆点
let active=ref(0)

// 上一页
const prev=()=>{
   active.value--
   if(active.value<0){
     active.value=slides.length-1
   }
}
// 下一页
const next=()=>{
  active.value++
  if(active.value > slides.length-1){
    active.value=0
  }
}
// 当组件加载完毕时 开启定时器 再ts中用setInterval 前面需要加windon
// 声明定时器名字
let timer=-1
onMounted(()=>{
  start()
})
// 页面跳转销毁
onUnmounted(()=>{
    // console.log('定时器销毁了');
    clearInterval(timer)
})

// 鼠标进入 轮播图停止
const stop=()=>{
clearInterval(timer)
}
// 鼠标离开 轮播图继续
const start=()=>{
    if(!autoplay) return
    timer= window.setInterval(()=>{
    // console.log('定时器开启了');
        next()
    },duration)
}
</script>

<template>
  <div class="xtx-carousel" @mouseenter="stop" @mouseleave="start">
    <!-- 轮播区域 显示与隐藏 是否有fade类  -->
    <ul class="carousel-body">
        <!--  -->
      <li :class="{fade:active===index}" class="carousel-item" v-for="(item,index) in slides" :key="item.id">
        <RouterLink :to="item.hrefUrl">
          <img
            :src="item.imgUrl"
            alt=""
          />
        </RouterLink>
      </li>
    
    </ul>
    <!-- 上一页 -->
    <a href="javascript:;" class="carousel-btn prev" @click="prev"
      ><i class="iconfont icon-angle-left"></i
    ></a>
    <!-- 下一页 -->
    <a href="javascript:;" class="carousel-btn next" @click="next"
      ><i class="iconfont icon-angle-right"></i
    ></a>
    <!-- 小圆点 -->
    <div class="carousel-indicator">
      <span 
      :class="{active:active===index}"
       v-for="(item,index) in slides"
        :key="item.id"
        @click="active=index"></span>
     
    </div>
  </div>
</template>

<style scoped lang="less">
.xtx-carousel {
  width: 100%;
  height: 100%;
  min-width: 300px;
  min-height: 150px;
  position: relative;
  .carousel {
    &-body {
      width: 100%;
      height: 100%;
    }
    &-item {
      width: 100%;
      height: 100%;
      position: absolute;
      left: 0;
      top: 0;
      opacity: 0;
      transition: opacity 0.5s linear;
      &.fade {
        opacity: 1;
        z-index: 1;
      }
      img {
        width: 100%;
        height: 100%;
      }
    }
    &-indicator {
      position: absolute;
      left: 0;
      bottom: 20px;
      z-index: 2;
      width: 100%;
      text-align: center;
      span {
        display: inline-block;
        width: 12px;
        height: 12px;
        background: rgba(0, 0, 0, 0.2);
        border-radius: 50%;
        cursor: pointer;
        ~ span {
          margin-left: 12px;
        }
        &.active {
          background: #fff;
        }
      }
    }
    &-btn {
      width: 44px;
      height: 44px;
      background: rgba(0, 0, 0, 0.2);
      color: #fff;
      border-radius: 50%;
      position: absolute;
      top: 228px;
      z-index: 2;
      text-align: center;
      line-height: 44px;
      opacity: 0;
      transition: all 0.5s;
      &.prev {
        left: 20px;
      }
      &.next {
        right: 20px;
      }
    }
  }
  &:hover {
    .carousel-btn {
      opacity: 1;
    }
  }
}
</style>